I really think this is personal preference. I love quartz. I think it is modern and sleek and love its uniform and unfussy look. I also like the grey you chose to go with the white cabinets. There has to be something that made you fall in love with it in the first place? The 2 looks will be really different. Black countertops on white cabinets has a lot of contrast whereas the quartz you picked has a more blending feel. I agree with bahacca and try to get samples in your space and maybe go look at the black granites at the granite yard with your cabinet door to see them together.

Problem with quartz is that industry is not telling the truth. Quartz is hardest material, harder than granite but the so called quartz slabs are not pure quartz, most of the quartz slabs has less than 60% quartz rest is all sort of industrial waste like granite/marble powder from quarry, glass and concrete and biggest culprit is the resin. Most manufacture states percentage of quartz vs resin by weight, this is just the marketing tactics, stone is heavier than plastic resin, if you look at volume most slab has 15-30% resin. Resin is biggest culprit when it comes to quartz staining and dull marks, resin is very soft material and it reacts with any household product like lemon juice, vinegar, wine, soap, tomato juice etc. and when you spill any kind of acidic/alkaline on quartz it creates etch mark, which looks like stain but it is a chemical reaction with resin, which you cannot get out unless you re-polish surface by professional guy. Even regular use abrasive object like magic eraser, or scotchbrite will create a dull mark when you rub quartz countertop with it for cleaning, it is cutting though soft resin and destroying fine finish. Quartz need to be treated like a baby, it is good for display in galley but not for daily use in kitchen. Egypt pyramid has granite which has withstand 3000-4000 year of abuse but todays quartz cannot withstand normal use and tear of daily kitchen activity. I made mistake of installing quartz, but I will never go back to quartz natural stone/granite is best option for me.

Honestly, I would definitely ditch that Caprice back splash. It's over kill on blue. I'd take a white quartz that has very SUBTLE and scattered veining, and use it everywhere. Go right up the back splash with it. Easiest clean up..... the range will be the star. Match the hood to it and be done : ) and you will have a light and fresh and still beachy result Or......... plain white quartz on the counters all.....and a splash in marble. Let the range "star" in both cases.http://www.marblesystems.com/product/glacier-honed-marble-tiles-2-3-4x5-1-2/

Call me crazy and soooo out of style, but I used Crema Bordeaux with black cabinetry and very light gray island. I like color and movement. Oops: Edited to say mine is granite; you were asking about quartz. Yep, out of style on that, too, but I've been using granite for 30 years, with quartz thrown in here and there in some kitchens, and I always go back to granite.